Convert any solid axle bicycle hub to a quick release hub in seconds! Simply remove the axle nuts and replace with these two devices! * Makes wheel removal safe and easy! Great for flat tire repair or wheel removal for transport in or on vehicles. * Equipped for most common axle size: 3/8" diameter, 26 threads per inch (3/8"x26T). * Conversion kits available for other sizes-see ARCN3824 (3/8"x24T) or ARCNM10 (Metric-M10x1.0) * Safest quick release system on the market with two (2) independent cams that ensure a secure connection everytime.